Add a special item called "splatter map", represented by an enchanted written map, that would replace (by default) the n map items given when requesting a poster map.

Right-clicking with it on an empty item frame would "deploy" the whole poster to all adjacent item frames.

• If the item frame wall is too small, the deploying is cancelled, and an error message is shown to the user.
• If the item frame wall is too large, the poster is positioned so that the clicked frame is the bottom-left corner of the poster (or as close as possible).

Shift-left-clicking on a deployed poster map would wrap it back in a single splatter map.